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Finding the Fourth Proportional to 972.08, 1,340.44 and 622.16

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Solution

The fourth proportional to 972.08, 1,340.44 and 622.16 is: 857.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.08 : 1,340.44 = 622.16 : x
  2. Step 2: Convert to fraction form
    972.08/1,340.44 = 622.16/x
  3. Step 3: Cross multiply
    972.08x = 1,340.44 × 622.16
  4. Step 4: Simplify right side
    972.08x = 833,968.15
  5. Step 5: Solve for x
    x = 833,968.15/972.08
  6. Step 6: Final answer
    x = 857.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.